Grinding-machine.



VILBL COPY P. H. ROOT. GRINDING MACHINE. APPLIGATION FILED SEPT. 5,1911.

1,044,575. Patented Nov. 19, 14912.

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vltl'ldl ATENT UFFlC.

PERCY HUBERT ROOT, OF PLYMOUTH, OHIO.

GRININGr-MACHlNE.

Lili-1h57 5 llatcntedNov. 19, 1912.

serial No. 647,577.

T o all whom it 'may concern.

Be it known that l, Pnnor ll. Boor, a citizen of t-he United States,residing at Plymouth, in the county of Richland and State of Ohio, haveinvented a certain new and useful improvement in Grinding-Machines, ofwhich the following is a full, clear, and exact description.

This invention relates to grinding machines of the type which includes arotary grinding plate or disk, and a work holder which presses the workdown onto the plate and is reciprocated to distribute the wear evenlyover the grinding surface,-machines of this type being especiallyadapted for grinding knives, blades of sheep and horse clippers andsimilar articles required to be dressed to a flat surface.

More particularly, the invention relates to mechanism for supporting andreciprocating the work holder and has for its object to provide in agrinding machine of this type a reciprocating mechanism for the workholder which is efficient, and simple in construction.

A further object is to provide a reciproeating mechanism which enablesth-e length of stroke to be very readily adjusted to adapt the machineto work of different sizes.

riChe above and other objects are accomplishecl by my invention, whichmay be briefly summarized as consisting in certain novel details ofconstruction and combination and arrangements of parts which will bedescribed in the specification and set forth in the appended claims.

ln the accompanying sheet of drawings, Figure 1 is a` top plan view of amachine constructed in accordance with my invention. Fig. Q is a sideview of the same; and Fig. 3 is a detail view partly in section alongthe line 3-3 of Fig. 2.

Referring now to the drawings, 10 represent-s a rotary grinding plate ordisk which is adapted to be provided on its upper face with a grindingpaste for grinding the knives and blades. The plate 10 is secured to theupper end of a vertical driving spindle 11 which is journaled inbearings 12, 12, of a frame designated, as a whole, by the referencecharacter 13. rlhe vertical spindle and grinding plate are rotated bymechanism including bevel gearing 1e and a horizontal. shaft 15, whichmay be driven in any suitable manner, but in this case is provided withtight and loose pulleys 16, so ward by the spring, causing that it maybe belt driven. rlhe shaft 15 may be provided with an emcry wheel 17which is adapted to rough grind the articles before being finished onthe grinding plate 10. `When the articles are being ground on the emerywheel, they are supported on a suitable rest 18.

A pair of arms or brackets 19 are secured to the frame and projectupwardly above the grinding plate 10 at diametrically opposite sidesthereof, and at the upper ends of these arms are journaled rollers Q0which constitute abutments for a slide or slide bar Q1 which extendsacross the plate above the same, and is designed to support the work.rlhis slide which is in the form of a flat bar has secured to its underside a spring 2Q, the free ends of which tend to spring up and to lieagainst the lower face of the bar, but are designed to be pressedyieldingly downward by adjustable thumb screws 23 which pass through thehar on opposite sides of its center. At the ends of this spring arecarried any suitable holders Q11 for the work to be ground, each of saidholders being preferably pivoted. to the spring, so that the work heldby it can accommodate itself to the surface of the grinding plata-thework which is carried by these holders being shown at 25.

The mechanism for reciprocating the slide and consequently the workholders and work forms the principal part of the present invention. Toreciprocate the slide 21, I employ the grinding plate 10 as a frictiondrive wheel to rotate a wheel 26 which is arranged preferably in avertical plane or at right angles to the grinding plate 10, and engagesthe same at a distance from its center. Preferably the grinding platemakes three or more revolutions to each revolution of the driven wheel26. This wheel 26 is mounted upon a stud 27 which extends into asuitable journal 28 of a bar 29 which also extends across the grindingplate 10` above the same substantially parallel to the slide 21. Thisbar is pivoted at one end by means of a screw 30 to one of the arms orbrackets 19, and at its opposite end is connected with the opposite armor bracket 19 through the medium of a spring 31 which is arrangedbetween the free end of the bar 29 and a clip 32 carried by a bolt orscrew 33 extending loosely through a slot of the bar 29 into the bracket19, so that the bar is pressed downthe driven wheel 26 to be held inyielding rictional engagement with the driving plate 10. Thisconstruction is illustrated in Fig. 3. The driven wheel 26 is providedwith a number of holes or sockets 34 which are located differentdistances from the center of the wheel, and in one of these openings isplaced a pin carrying a roller 35 which works loosely in the verticalslot of an upright member 36 which is secured to the slide 2l at itscenter. Thus through the trictional engagement of the grinding plate l0and the wheel 26, said wheel is rotated at the proper speed, and as itis rotated the pin and roller 35 serves as a crank which, by itsengagement with the slotted member 36, causes the slide to bereciprocated, the throw of the slide in each direction being equal tothe distance of the center of the roller 35 to the center of the wheel26. This mechanism for reciprocating the slide is very efficient andreliable and at the same time is inexpensive and simple in itsconstruction.

The articles to be ground are attached to the holders and are pressedagainst the grinding plate by means of the screws 23 and spring 22, andthe rot-ation of the grinding plate causes the sliding bar toreciprocate so as to carry the work in and out over the grindingplate,-the range of movement being sufficient to bring the whole workingsurface of the grinding plate into use, thereby maintaining the grindingplate true to its original surface. Vhe-n wider blades are to be ground,the roller 35 is placed in a hole of the wheel 26 nearer the center,thereby reducing the length of stroke of the sliding bar and avoidingthe danger of the blades being projected beyond the periphery of thegrinding plate and engaging the brackets 19.

I-Iaving thus described my invention, what I claim is:

l. In combination in a grinding machine, a frame, a rotary grindingplate, a driving spindle support-ing the same, a work holding slidearranged at one side of the plate, and mechanism including a frictiondrive wheel in engagement with the grinding plate for reciprocating saidslide.

2. In a grinding machine, a rotary grinding plate, a vertical drivingspindle supporting the same, a work holding slide arranged above theplate, and means for reciprocating the slide comprising a wheel infrictional engagement with the grinding plate and having an operativeconnection with the slide, a support for said wheel, and means acting onsaid support to press the wheel yieldingly onto said grinding plate.

3. In combination in a grinding machine, a rotary grinding plate, avertical spindle supporting the same, a work holding slide arrangedabove the plate, and means for reciprocating said slide comprising awheel in rictional engagement with the grinding plate, a stud projectingoutwardly from said wheel, a slotted member carried by said slide andengaged by said stud.

t. In combination in a grinding machine, a rotary grinding plate, avertical spindle supporting the same, a work holding slide arranged andsupported above the grinding plate, means for reciprocating the slidecomprising a wheel in frictional engagement with the grinding plate, asupport for said wheel having means for pressing the wheel yieldinglyinto engagement with the grinding` plate, said wheel having a pluralityof openings arranged dierent distances from the center thereof, a rollersupported in one of said openings, and an upright member on the slideprovided with a vertical slot which receives said roller.

In testimony whereof, I hereunto atlix my signature in the presence oftwo witnesses.

PERCY HUBERT ROOT.

Vitnesses:

O. S. EARNEST, D. GLICK.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

